/ Dictionary / Index B bigmouthed: Meaning and Definition of Find definitions for: big•mouthed Pronunciation: (big'moutht", -moud"), [key] — adj. having a very large mouth. very talkative; loud-mouthed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bigmouthed (Thesaurus) bigmouth buffalofish Big Muddy Related Content Daily Word Quiz: dentifrice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language